I hate the smell of the Ona, too - it smells like a urinal!
You can use less Ona and add some water to it which will dilute the smell. It still won't be as effective as a larger carbon filter/fan combo, it will just be less of an investment.
Have you been fertilizing or just relying on the nutes in the soil to get you through? With a long veg, if not fertilizing, she may have exhausted the nutes in the original soil and needs a refresh.
You can use less Ona and add some water to it which will dilute the smell. It still won't be as effective as a larger carbon filter/fan combo, it will just be less of an investment.
Have you been fertilizing or just relying on the nutes in the soil to get you through? With a long veg, if not fertilizing, she may have exhausted the nutes in the original soil and needs a refresh.